Tube-mill.



H. Wi HABEINGEi TUBE MILL.

APPLIUATION FILI-3D MAY 1906.

Pamed Jan. i12, 1969.

HARRY W. HARDINGE, OF NEW YORK, N Y.

TUBE-MILL Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed May 9, 1906. SerialiNio. 316,856.

To all whom 'it may concern:

Beit known that l, HARRY W. l-lAnDiNGE, a citizen of the United States, residing at New York, in the county and State of ew York, have invented certain new and useful Improvements in Tubedvlills, of which the following is a speciiication.

My invention relates to grinding machines, more particularly the type in which the material to be ground or pulverized is tumbled in a rotating cylindrical drum, or tubemill, as 1t 1s commonly known, with lor without the aid of metal balls or other hard and non-friable bodies. The tubemill or drum is supported by and rotated on axially extending tubular trunnions, and

in the usual form of apparatus the material is continuously introduced into the drum through one of the hollow trunnions by the agency of a screw conveyor working therein, or `by gravity from a stationary hopper or other receptacle which discharges into the trunnion. These feeding devices possess certain defects, the most serious of which is the wear, between the rotating trunnion and the parte of the rotating parts 'or stationary part cooperating therewith,

vide feeding apparatus of .the simplestl character, but which will at the same time feed the material into the tuhemill while the same is revolving.

4To these 'and other ends the invention consists in the novel features of construetion, arrangements of parts, and combinations of elements hereinafter described, and more particularly set forth in the claims.

A convenient embodiment of the invention is illustrated in the annexed dran-fing, in which Figure l is a side elevation of the inlet end l of a tube mill, showing, in section, my irnprovedfeeding devlce applied thereto. Fig.

I 2..is an enlarged cross section of the feeding device or scoop, on line a-e. Fig. 3 is a longitudinal section of a modified forni of scoop.

The drum or tubemill is indicated. by l, and 2 designates one of the trunnionson which it revolves. r[his trunnion is tubular, as shown, and through it the material to be ground is introduced into the tubeinill.

3 is a scoop, formed by a curved wall a and parallel side walls 5, o. The curved wall is substantially spiral in form, and extendsaround a tubular member 7, thus forming around said member a spiral passage, opening into the same throng an aperture 8. rl`he tubular member projects outward from the wall 6 and is provided at its end -with an outwardly extending radial liange ciple of the screw of Archimedes, up to the v tubular member 7 and is ilnally discharged into the latter through the aperture 8, whence it passes through the hollow trunnion into the tubemill. This o eration is repeated at every revolution of t 1e tubemill, as will be readilv'understood.

It will be noted that as illustrated in Figs.

'l and 2, the tubemill, with the scoop arranged at that end, must rotate counterclockwise. 1

'ln Fig. 3 is shown a scoop which may be reversed, so as to be used, it' desired, with a clockwise or counter-clockwise rotation at will. ln this form the tubular member 7 is open at each end, through the walls 5, 6, but has its extension 751 removably secured by means of a 'flange 7b, by means of which it may be bolted at either end of the tubular member. '.lhe open end of the latter is then closed by a plate 13. Assembled as in Fig. 3 the scoop can be reversed and secured to the trunnion 2 by means of the flange t), wheree upon the rotation el the tubeniill can be reversed and thc feed go on as before.

When the tubemill is'to rotate counterclockwisc, as in Fig. l, the extension 7* and plate 13 are sim ly exchanged and the scoop reversed, as Wil be readily understood.

From the foregoing it will be seen that the scoop is rigidly connected with the drum and its trunnion, and that there is therefore no relative movement between any of these arts. The 4trunnion simply rotates in its caring, which can easily be protected. At the same tirne the feed of material, though in a sense intermittent, may be made suiiic'ient for the capacity of the machine by-making the scoop of proper size.

I he specilic form herein describedv is of course merely one embodiment of the invention, which may be embodied in a variety of' formsl without departure from its proper scope. Another species of the generic invention is describedand claimed in my copending application iiled of even date herewith.

What I claim is:

1. 'l he combination With a rotating tubemill having a tubular trunnion opening into in register therewith` and havin a similar aperture in the opposite side Wal and a removable cloaure over the last-mentioned aperture, as set* fortlrg 2. 'lhe combinatwn Wlth a rotating tubemill having a tubular trunnion opening into thesame, of a tubular member secured on v the end of the trunnionand inline therewith,

a spiral scoop removably secured to the tubular member, having an aperture in its con! tiguous side Wall in register with the interior of the tubular member and ha ing a similar; aperture in the opposite side wall,` land a elosure removably secured over the last-mentionedaperture, as set forth.

HARRY W. HARDINGE. Witnesses: y

M. LAWSON DYER,`

S. S. DUNHAM. 

